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"You may have heard others talk about using a light box to treat their sleep disorders, but what is a light box and what conditions respond best to light therapy? Are there alternatives to purchasing an expensive light box? Learn the answers with the help of UpToDate, a resource for health care providers and patients alike."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.verywell.com/insomnia-treatment-option-phototherapy-3015202>